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CAIE A-Level Chemistry AS 17 Carbonyl Compounds Questions

Practise aldehyde and ketone preparation, reactions, qualitative tests and nucleophilic addition at C=O.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

17.1 Aldehydes and ketones

Question 1

[Maximum number: 2]

Compound X contains the same functional groups as citric acid.

citric acid

citric acid

The table describes some of the similarities and differences between citric acid and compound X.

Table for Question 1 — CAIE A-Level Chemistry AS

Explain why compound X reacts with acidified Cr2O72−\mathrm{Cr}_{2} \mathrm{O}_{7}{ }^{2-} but citric acid does not.

Question 2

[Maximum number: 1]

Which statement about butanone is correct?

A

Butanone can be dehydrated by concentrated sulfuric acid to give CH2=CHCH=CH2\mathrm{CH}_{2}=\mathrm{CHCH}=\mathrm{CH}_{2}.

B

Butanone gives a positive result with Tollens' reagent.

C

Butanone reacts with HCN by an electrophilic addition mechanism.

D

Butanone reacts with NaBH4\mathrm{NaBH}_{4} to give a chiral product.

Question 3

[Maximum number: 1]

The mechanism for the reaction between ethanal and hydrogen cyanide starts with the step shown.

Figure for Question 3 — CAIE A-Level Chemistry AS

What is the correct structure of the intermediate ion formed, and what is the next step in this mechanism?

A
Figure for Question 3 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 3 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 3 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 3 — CAIE A-Level Chemistry AS — Option D

Question 4

[Maximum number: 1]

Which compound will produce a yellow-orange precipitate when added to 2,4-dinitrophenylhydrazine?

A
Figure for Question 4 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 4 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 4 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 4 — CAIE A-Level Chemistry AS — Option D
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